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<title>class OpenSSL::ASN1::Constructive - openssl: Ruby Standard Library Documentation</title>


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  <h3>Table of Contents</h3>

  <ul class="link-list" role="directory">
    <li><a href="#class-OpenSSL::ASN1::Constructive-label-SET+and+SEQUENCE">SET and SEQUENCE</a>
    <li><a href="#class-OpenSSL::ASN1::Constructive-label-Example+-+constructing+a+SEQUENCE">Example - constructing a SEQUENCE</a>
    <li><a href="#class-OpenSSL::ASN1::Constructive-label-Example+-+constructing+a+SET">Example - constructing a SET</a>
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  <h3>Parent</h3>

  <p class="link"><a href="ASN1Data.html">OpenSSL::ASN1::ASN1Data</a>
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  <h3>Included Modules</h3>

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    <li><span class="include">Enumerable</span>
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    <main role="main" aria-labelledby="class-OpenSSL::ASN1::Constructive">
    <h1 id="class-OpenSSL::ASN1::Constructive" class="class">
      class OpenSSL::ASN1::Constructive
    </h1>

    <section class="description">
    
<p>The parent class for all constructed encodings. The <em>value</em> attribute of a <a href="Constructive.html"><code>Constructive</code></a> is always an Array. Attributes are the same as for <a href="ASN1Data.html"><code>ASN1Data</code></a>, with the addition of <em>tagging</em>.</p>

<h2 id="class-OpenSSL::ASN1::Constructive-label-SET+and+SEQUENCE">SET and SEQUENCE<span><a href="#class-OpenSSL::ASN1::Constructive-label-SET+and+SEQUENCE">&para;</a> <a href="#top">&uarr;</a></span></h2>

<p>Most constructed encodings come in the form of a SET or a SEQUENCE. These encodings are represented by one of the two sub-classes of Constructive:</p>
<ul><li>
<p>OpenSSL::ASN1::Set</p>
</li><li>
<p>OpenSSL::ASN1::Sequence</p>
</li></ul>

<p>Please note that tagged sequences and sets are still parsed as instances of <a href="ASN1Data.html"><code>ASN1Data</code></a>. Find further details on tagged values there.</p>

<h3 id="class-OpenSSL::ASN1::Constructive-label-Example+-+constructing+a+SEQUENCE">Example - constructing a SEQUENCE<span><a href="#class-OpenSSL::ASN1::Constructive-label-Example+-+constructing+a+SEQUENCE">&para;</a> <a href="#top">&uarr;</a></span></h3>

<pre class="ruby"><span class="ruby-identifier">int</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">Integer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-value">1</span>)
<span class="ruby-identifier">str</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">PrintableString</span>.<span class="ruby-identifier">new</span>(<span class="ruby-string">&#39;abc&#39;</span>)
<span class="ruby-identifier">sequence</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">Sequence</span>.<span class="ruby-identifier">new</span>( [ <span class="ruby-identifier">int</span>, <span class="ruby-identifier">str</span> ] )
</pre>

<h3 id="class-OpenSSL::ASN1::Constructive-label-Example+-+constructing+a+SET">Example - constructing a SET<span><a href="#class-OpenSSL::ASN1::Constructive-label-Example+-+constructing+a+SET">&para;</a> <a href="#top">&uarr;</a></span></h3>

<pre class="ruby"><span class="ruby-identifier">int</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">Integer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-value">1</span>)
<span class="ruby-identifier">str</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">PrintableString</span>.<span class="ruby-identifier">new</span>(<span class="ruby-string">&#39;abc&#39;</span>)
<span class="ruby-identifier">set</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">Set</span>.<span class="ruby-identifier">new</span>( [ <span class="ruby-identifier">int</span>, <span class="ruby-identifier">str</span> ] )
</pre>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">



        <section class="attribute-method-details" class="method-section">
        <header>
        <h3>Attributes</h3>
        </header>

          <div id="attribute-i-tagging" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">tagging</span><span
                class="attribute-access-type">[RW]</span>
            </div>

            <div class="method-description">
              <p>May be used as a hint for encoding a value either implicitly or explicitly by setting it either to <code>:IMPLICIT</code> or to <code>:EXPLICIT</code>. <em>tagging</em> is not set when a ASN.1 structure is parsed using <a href="../ASN1.html#method-c-decode"><code>OpenSSL::ASN1.decode</code></a>.</p>
              </div>
            </div>
            </section>


                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-new" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          OpenSSL::ASN1::Primitive.new(value [, tag, tagging, tag_class ]) &rarr; Primitive
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p><em>value</em>: is mandatory.</p>

<p><em>tag</em>: optional, may be specified for tagged values. If no <em>tag</em> is specified, the UNIVERSAL tag corresponding to the <a href="Primitive.html"><code>Primitive</code></a> sub-class is used by default.</p>

<p><em>tagging</em>: may be used as an encoding hint to encode a value either explicitly or implicitly, see <a href="../ASN1.html"><code>ASN1</code></a> for possible values.</p>

<p><em>tag_class</em>: if <em>tag</em> and <em>tagging</em> are <code>nil</code> then this is set to <code>:UNIVERSAL</code> by default. If either <em>tag</em> or <em>tagging</em> are set then <code>:CONTEXT_SPECIFIC</code> is used as the default. For possible values please cf. <a href="../ASN1.html"><code>ASN1</code></a>.</p>

<h2 id="method-c-new-label-Example">Example<span><a href="#method-c-new-label-Example">&para;</a> <a href="#top">&uarr;</a></span></h2>

<pre class="ruby"><span class="ruby-identifier">int</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">Integer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-value">42</span>)
<span class="ruby-identifier">zero_tagged_int</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">Integer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-value">42</span>, <span class="ruby-value">0</span>, <span class="ruby-value">:IMPLICIT</span>)
<span class="ruby-identifier">private_explicit_zero_tagged_int</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">ASN1</span><span class="ruby-operator">::</span><span class="ruby-constant">Integer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-value">42</span>, <span class="ruby-value">0</span>, <span class="ruby-value">:EXPLICIT</span>, <span class="ruby-value">:PRIVATE</span>)
</pre>

                              <div class="method-source-code" id="new-source">
            <pre>static VALUE
ossl_asn1_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE value, tag, tagging, tag_class;
    int default_tag;

    rb_scan_args(argc, argv, &quot;13&quot;, &amp;value, &amp;tag, &amp;tagging, &amp;tag_class);
    default_tag = ossl_asn1_default_tag(self);

    if (default_tag == -1 || argc &gt; 1) {
        if(NIL_P(tag))
            ossl_raise(eASN1Error, &quot;must specify tag number&quot;);
        if(!NIL_P(tagging) &amp;&amp; !SYMBOL_P(tagging))
            ossl_raise(eASN1Error, &quot;invalid tagging method&quot;);
        if(NIL_P(tag_class)) {
            if (NIL_P(tagging))
                tag_class = sym_UNIVERSAL;
            else
                tag_class = sym_CONTEXT_SPECIFIC;
        }
        if(!SYMBOL_P(tag_class))
            ossl_raise(eASN1Error, &quot;invalid tag class&quot;);
    }
    else{
        tag = INT2NUM(default_tag);
        tagging = Qnil;
        tag_class = sym_UNIVERSAL;
    }
    ossl_asn1_set_tag(self, tag);
    ossl_asn1_set_value(self, value);
    ossl_asn1_set_tagging(self, tagging);
    ossl_asn1_set_tag_class(self, tag_class);
    ossl_asn1_set_indefinite_length(self, Qfalse);
    if (default_tag == V_ASN1_BIT_STRING)
        rb_ivar_set(self, sivUNUSED_BITS, INT2FIX(0));

    return self;
}</pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-each" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          each { |asn1| block } &rarr; asn1_ary
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Calls the given block once for each element in self, passing that element as parameter <em>asn1</em>. If no block is given, an enumerator is returned instead.</p>

<h2 id="method-i-each-label-Example">Example<span><a href="#method-i-each-label-Example">&para;</a> <a href="#top">&uarr;</a></span></h2>

<pre class="ruby"><span class="ruby-identifier">asn1_ary</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">asn1</span><span class="ruby-operator">|</span>
  <span class="ruby-identifier">puts</span> <span class="ruby-identifier">asn1</span>
<span class="ruby-keyword">end</span>
</pre>

                              <div class="method-source-code" id="each-source">
            <pre>static VALUE
ossl_asn1cons_each(VALUE self)
{
    rb_block_call(ossl_asn1_get_value(self), id_each, 0, 0, 0, 0);

    return self;
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-to_der" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          to_der &rarr; DER-encoded String
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>See <a href="ASN1Data.html#method-i-to_der"><code>ASN1Data#to_der</code></a> for details.</p>

                              <div class="method-source-code" id="to_der-source">
            <pre>static VALUE
ossl_asn1cons_to_der(VALUE self)
{
    VALUE ary, str;
    long i;
    int indef_len;

    indef_len = RTEST(ossl_asn1_get_indefinite_length(self));
    ary = rb_convert_type(ossl_asn1_get_value(self), T_ARRAY, &quot;Array&quot;, &quot;to_a&quot;);
    str = rb_str_new(NULL, 0);
    for (i = 0; i &lt; RARRAY_LEN(ary); i++) {
        VALUE item = RARRAY_AREF(ary, i);

        if (indef_len &amp;&amp; rb_obj_is_kind_of(item, cASN1EndOfContent)) {
            if (i != RARRAY_LEN(ary) - 1)
                ossl_raise(eASN1Error, &quot;illegal EOC octets in value&quot;);

            /*
             * EOC is not really part of the content, but we required to add one
             * at the end in the past.
             */
            break;
        }

        item = ossl_to_der_if_possible(item);
        StringValue(item);
        rb_str_append(str, item);
    }

    return to_der_internal(self, 1, indef_len, str);
}</pre>
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